chore(package): update eslint to version 5.0.0 (#253)

Author: greenkeeper[bot]

handwritten/storage/package.json

@@ -91,7 +91,7 @@
     "@google-cloud/nodejs-repo-tools": "^2.2.3",
     "@google-cloud/pubsub": "*",
     "codecov": "^3.0.0",
-    "eslint": "^4.7.1",
+    "eslint": "^5.0.0",
     "eslint-config-prettier": "^2.5.0",
     "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-prettier": "^2.3.1",